drivers/input/touchscreen/mk712.c

   1 /*
   2  * ICS MK712 touchscreen controller driver
   3  *
   4  * Copyright (c) 1999-2002 Transmeta Corporation
   5  * Copyright (c) 2005 Rick Koch <n1gp@hotmail.com>
   6  * Copyright (c) 2005 Vojtech Pavlik <vojtech@suse.cz>
   7  */
   8
   9 /*
  10  * This program is free software; you can redistribute it and/or modify it
  11  * under the terms of the GNU General Public License version 2 as published by
  12  * the Free Software Foundation.
  13  */
  14
  15 /*
  16  * This driver supports the ICS MicroClock MK712 TouchScreen controller,
  17  * found in Gateway AOL Connected Touchpad computers.
  18  *
  19  * Documentation for ICS MK712 can be found at:
  20  *      http://www.icst.com/pdf/mk712.pdf
  21  */
  22
  23 /*
  24  * 1999-12-18: original version, Daniel Quinlan
  25  * 1999-12-19: added anti-jitter code, report pen-up events, fixed mk712_poll
  26  *             to use queue_empty, Nathan Laredo
  27  * 1999-12-20: improved random point rejection, Nathan Laredo
  28  * 2000-01-05: checked in new anti-jitter code, changed mouse protocol, fixed
  29  *             queue code, added module options, other fixes, Daniel Quinlan
  30  * 2002-03-15: Clean up for kernel merge <alan@redhat.com>
  31  *             Fixed multi open race, fixed memory checks, fixed resource
  32  *             allocation, fixed close/powerdown bug, switched to new init
  33  * 2005-01-18: Ported to 2.6 from 2.4.28, Rick Koch
  34  * 2005-02-05: Rewritten for the input layer, Vojtech Pavlik
  35  *
  36  */
  37
  38 #include <linux/module.h>
  39 #include <linux/moduleparam.h>
  40 #include <linux/kernel.h>
  41 #include <linux/init.h>
  42 #include <linux/errno.h>
  43 #include <linux/delay.h>
  44 #include <linux/ioport.h>
  45 #include <linux/interrupt.h>
  46 #include <linux/input.h>
  47 #include <asm/io.h>
  48
  49 MODULE_AUTHOR("Daniel Quinlan <quinlan@pathname.com>, Vojtech Pavlik <vojtech@suse.cz>");
  50 MODULE_DESCRIPTION("ICS MicroClock MK712 TouchScreen driver");
  51 MODULE_LICENSE("GPL");
  52
  53 static unsigned int mk712_io = 0x260;   /* Also 0x200, 0x208, 0x300 */
  54 module_param_named(io, mk712_io, uint, 0);
  55 MODULE_PARM_DESC(io, "I/O base address of MK712 touchscreen controller");
  56
  57 static unsigned int mk712_irq = 10;     /* Also 12, 14, 15 */
  58 module_param_named(irq, mk712_irq, uint, 0);
  59 MODULE_PARM_DESC(irq, "IRQ of MK712 touchscreen controller");
  60
  61 /* eight 8-bit registers */
  62 #define MK712_STATUS            0
  63 #define MK712_X                 2
  64 #define MK712_Y                 4
  65 #define MK712_CONTROL           6
  66 #define MK712_RATE              7
  67
  68 /* status */
  69 #define MK712_STATUS_TOUCH                      0x10
  70 #define MK712_CONVERSION_COMPLETE               0x80
  71
  72 /* control */
  73 #define MK712_ENABLE_INT                        0x01
  74 #define MK712_INT_ON_CONVERSION_COMPLETE        0x02
  75 #define MK712_INT_ON_CHANGE_IN_TOUCH_STATUS     0x04
  76 #define MK712_ENABLE_PERIODIC_CONVERSIONS       0x10
  77 #define MK712_READ_ONE_POINT                    0x20
  78 #define MK712_POWERUP                           0x40
  79
  80 static struct input_dev mk712_dev;
  81 static DEFINE_SPINLOCK(mk712_lock);
  82
  83 static irqreturn_t mk712_interrupt(int irq, void *dev_id, struct pt_regs *regs)
  84 {
  85         unsigned char status;
  86         static int debounce = 1;
  87         static unsigned short last_x;
  88         static unsigned short last_y;
  89
  90         spin_lock(&mk712_lock);
  91         input_regs(&mk712_dev, regs);
  92
  93         status = inb(mk712_io + MK712_STATUS);
  94
  95         if (~status & MK712_CONVERSION_COMPLETE) {
  96                 debounce = 1;
  97                 goto end;
  98         }
  99
 100         if (~status & MK712_STATUS_TOUCH)
 101         {
 102                 debounce = 1;
 103                 input_report_key(&mk712_dev, BTN_TOUCH, 0);
 104                 goto end;
 105         }
 106
 107         if (debounce)
 108         {
 109                 debounce = 0;
 110                 goto end;
 111         }
 112
 113         input_report_key(&mk712_dev, BTN_TOUCH, 1);
 114         input_report_abs(&mk712_dev, ABS_X, last_x);
 115         input_report_abs(&mk712_dev, ABS_Y, last_y);
 116
 117 end:
 118
 119         last_x = inw(mk712_io + MK712_X) & 0x0fff;
 120         last_y = inw(mk712_io + MK712_Y) & 0x0fff;
 121         input_sync(&mk712_dev);
 122         spin_unlock(&mk712_lock);
 123         return IRQ_HANDLED;
 124 }
 125
 126 static int mk712_open(struct input_dev *dev)
 127 {
 128         unsigned long flags;
 129
 130         spin_lock_irqsave(&mk712_lock, flags);
 131
 132         outb(0, mk712_io + MK712_CONTROL); /* Reset */
 133
 134         outb(MK712_ENABLE_INT | MK712_INT_ON_CONVERSION_COMPLETE |
 135                 MK712_INT_ON_CHANGE_IN_TOUCH_STATUS |
 136                 MK712_ENABLE_PERIODIC_CONVERSIONS |
 137                 MK712_POWERUP, mk712_io + MK712_CONTROL);
 138
 139         outb(10, mk712_io + MK712_RATE); /* 187 points per second */
 140
 141         spin_unlock_irqrestore(&mk712_lock, flags);
 142
 143         return 0;
 144 }
 145
 146 static void mk712_close(struct input_dev *dev)
 147 {
 148         unsigned long flags;
 149
 150         spin_lock_irqsave(&mk712_lock, flags);
 151
 152         outb(0, mk712_io + MK712_CONTROL);
 153
 154         spin_unlock_irqrestore(&mk712_lock, flags);
 155 }
 156
 157 static struct input_dev mk712_dev = {
 158         .evbit   = { BIT(EV_KEY) | BIT(EV_ABS) },
 159         .keybit  = { [LONG(BTN_TOUCH)] = BIT(BTN_TOUCH) },
 160         .absbit  = { BIT(ABS_X) | BIT(ABS_Y) },
 161         .open    = mk712_open,
 162         .close   = mk712_close,
 163         .name    = "ICS MicroClock MK712 TouchScreen",
 164         .phys    = "isa0260/input0",
 165         .absmin  = { [ABS_X] = 0, [ABS_Y] = 0 },
 166         .absmax  = { [ABS_X] = 0xfff, [ABS_Y] = 0xfff },
 167         .absfuzz = { [ABS_X] = 88, [ABS_Y] = 88 },
 168         .id      = {
 169                 .bustype = BUS_ISA,
 170                 .vendor  = 0x0005,
 171                 .product = 0x0001,
 172                 .version = 0x0100,
 173         },
 174 };
 175
 176 int __init mk712_init(void)
 177 {
 178
 179         if(!request_region(mk712_io, 8, "mk712"))
 180         {
 181                 printk(KERN_WARNING "mk712: unable to get IO region\n");
 182                 return -ENODEV;
 183         }
 184
 185         outb(0, mk712_io + MK712_CONTROL);
 186
 187         if ((inw(mk712_io + MK712_X) & 0xf000) ||       /* Sanity check */
 188             (inw(mk712_io + MK712_Y) & 0xf000) ||
 189             (inw(mk712_io + MK712_STATUS) & 0xf333)) {
 190                 printk(KERN_WARNING "mk712: device not present\n");
 191                 release_region(mk712_io, 8);
 192                 return -ENODEV;
 193         }
 194
 195         if(request_irq(mk712_irq, mk712_interrupt, 0, "mk712", &mk712_dev))
 196         {
 197                 printk(KERN_WARNING "mk712: unable to get IRQ\n");
 198                 release_region(mk712_io, 8);
 199                 return -EBUSY;
 200         }
 201
 202         input_register_device(&mk712_dev);
 203
 204         printk(KERN_INFO "input: ICS MicroClock MK712 TouchScreen at %#x irq %d\n", mk712_io, mk712_irq);
 205
 206         return 0;
 207 }
 208
 209 static void __exit mk712_exit(void)
 210 {
 211         input_unregister_device(&mk712_dev);
 212         free_irq(mk712_irq, &mk712_dev);
 213         release_region(mk712_io, 8);
 214 }
 215
 216 module_init(mk712_init);
 217 module_exit(mk712_exit);